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A sensor is mainly used to:
A. store data
B. read physical values from environment
C. translate text
D. display digital data
B. read physical values from environment
Real physical values are mostly:
A. digital
B. binary
C. analogue
D. static
C. analogue
Which sensor measures heat energy of surroundings?
A. moisture sensor
B. temperature sensor
C. pH sensor
D. gas sensor
B. temperature sensor
Which sensor is used for automatic street lights?
A. temperature sensor
B. light sensor
C. pH sensor
D. gas sensor
B. light sensor
Microphones are:
A. acoustic sensors
B. pressure sensors
C. proximity sensors
D. level sensors
A. acoustic sensors
When phone changes from portrait to landscape, which sensor helps?
A. pressure sensor
B. humidity sensor
C. accelerometer
D. pH sensor
C. accelerometer
Active infrared sensor works by:
A. detecting body heat
B. breaking an invisible beam
C. measuring pH value
D. using ultrasonic sound
B. breaking an invisible beam
Pressure sensors convert pressure into:
A. voltage
B. text
C. images
D. network signals
A. voltage
Flow sensors are mainly used to measure:
A. moving liquid or gas rate
B. body temperature
C. body heat
D. position of an object
A. moving liquid or gas rate
Which type of sensor measures the amount of moisture in the air?
Humidity Sensor
Which type of sensor measures acidity or alkalinity ?
PH Sensor
Name two uses of proximity sensors.
Phones (screen off when its near to your ear),
Automatic doors.
A sensor normally sends data to the processor in:
A. analogue
B. hexadecimal
C. binary only
D. ASCII text
A. analogue
ADC stands for:
Analogue to Digital Converter
Which sensor helps automatic water sprinklers to turn ON in farms?
Humidity Sensor
In supermarkets, automatic doors open when someone comes near. Which sensor is used?
proximity sensor
Which sensor helps phones automatically increase brightness in sunlight?
light sensor
Inside refrigerators, which type of sensor controls cooling?
temperature sensor
Which sensor type helps robots avoid crashing into walls?
proximity sensor
Which activity needs “control” not just monitoring?
A. checking the air pollution level once per day
B. showing humidity on screen only
C. turning AC ON when humidity goes too high
D. printing report of temperature
C. turning AC ON when humidity goes too high
Which sensor is mainly sensitive to elasticity & spring force?
A. pressure sensor
B. light sensor
C. sound sensor
D. moisture sensor
A. pressure sensor
A sensor used in gaming consoles to detect tilting of the remote is:
accelerometer
Accelerometers measure:
A. temperature
B. motion
C. oxygen
D. humidity
B. motion
give 2 uses of gas sensors
air quality monitors, carbon monoxide alarms
name 2 uses of acoustic sensors
environmental monitoring, sonar